{"product_id":"siemens-q390h-circuit-breaker","title":"Siemens | Q390H | Circuit Breaker | 90A | 3-Pole | 240V | 22kA | Plug-In","description":"\u003cdiv\u003e\n\u003cp\u003eSiemens Q390H stands as a reliable, plug-in circuit protection solution for 240V three-phase systems. Designed for maintenance, retrofit, and replacement scenarios where exact specifications matter, this 3-pole breaker delivers consistent performance with a robust 90A rating and a 22kA interrupting capacity. The plug-in design simplifies swaps in compatible Siemens panels, helping you minimize downtime during critical service windows.\u003c\/p\u003e \u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 90 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 3-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInterrupting capacity:\u003c\/strong\u003e 22kA\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eConnection style:\u003c\/strong\u003e Plug-In\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this Siemens Q390H stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\u003cstrongprecise specifications for reliable protection:\u003e 90 A at 240V with a solid 22kA interrupting capability ensures dependable short-circuit protection in commercial or industrial panel boards.\u003c\/strongprecise\u003e\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePlug-In convenience:\u003c\/strong\u003e Quick, tool-free replacement within compatible load centers reduces downtime and simplifies ongoing maintenance or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility-driven design:\u003c\/strong\u003e The Q390H is identified by its part number, making it the best reference when confirming fit and ratings for your panel or retrofit project.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eTargeted use cases:\u003c\/strong\u003e Ideal for service upgrades, panel retrofits, or spare parts planning where a precise Siemens 3-pole, 90A, 240V solution is required.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eUse cases and scenarios\u003c\/h2\u003e\n\u003cp\u003eWhether you’re refreshing an aging electrical panel in a commercial facility, performing a controlled retrofit to accommodate new equipment, or stocking a reliable spare for routine maintenance, the Q390H delivers predictable protection without complicating installation. Its 3-pole configuration supports 3-phase distribution systems, keeping equipment safely isolated during faults while enabling smooth coordination with upstream protection devices.\u003c\/p\u003e \u003ch2\u003eInstallation and compatibility tips\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eVerify compatibility first:\u003c\/strong\u003e Use the part number as your primary reference to ensure the Q390H will drop into your Siemens-compatible load center or panel board.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBefore ordering:\u003c\/strong\u003e Confirm the panel’s rating and pole arrangement match the Q390H’s 3-pole, 90A, 240V specifications to avoid mismatches.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReplacement approach:\u003c\/strong\u003e The plug-in design supports quick swap-outs—great for scheduled maintenance or unexpected outages where minimizing downtime matters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for professionals who value precise specifications, straightforward installation, and dependable protection, the Siemens Q390H 3-Pole 90A 240V Plug-In Circuit Breaker is a focused, practical choice for maintaining safe, efficient electrical systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46425633489058,"sku":"Q390H","price":228.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/siemens-q390h-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}